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CITY of ORONO <br />Municipal Offices <br />Post Office Box 66 <br />Crystal Bay, Minnesota 553~ <br />HARDCOVER ORDINANCE -In 1975, the Orono City Council adopted an ordinance limiting <br />the percentage of lot area that can be covered with impervious surface ("hardcover") such as <br />roofs, driveways, sidewalks, etc. on properties located within 1,000 feet of a lake. Studies have <br />shown that sediments, oils, and debris carried into the lake from highly urbanized areas have <br />a detrimental impact on the quality of water in the lake. The intent of Orono's ordinance is to <br />ensure that rainfall run-off will be cleansed by filtering through grassed or vegetated yard areas <br />before entering the lake. <br />Hardcover Zones -Allowed Percentages: <br />0-75 0% <br />75-250' 25% <br />250-500' 30% <br />500-1000' 35% <br />Hardcover includes: <br />-Roofs <br />-Sidewalks <br />-Paved or gravel driveways <br />-Patios & decks (includes slatted decks) <br />-Tops of retaining walls & rock walls <br />-Decorative landscape areas underlain by plastic sheeting or fabric <br />-Any other surface that does not allow direct absorption of rainfall <br />into the ground <br />INSTRUCTIONS FOR COMPLETING HARDCOVER CALCULATION WORKSHEET <br />1. Circle which setback zone (0-75', 75-250', etc.) the calculation is for. <br />2. For each item of hardcover within that zone, enter the length and width, and multiply to <br />get square footage (s.f.). <br />3. Add up all the square footages to get total square footage of hardcover. <br />4. Divide by the total area of property within the zone and multiply by 100 to get <br />percentage of hardcover in the zone. <br />5. If changes in hardcover are proposed, you should do a "before" worksheet and "after" <br />worksheet. If either results in percentages greater than those allowed, contact City staff <br />before proceeding with your project planning! <br />TELEPHONE -47ffj357 • FAX -473--0510